For the phone photographers out there, have you ever sold your photos for money?

My brother keeps nagging me to try and sell my photos that I took with my Lumia 1020. Over the course of 2 years I have taken over 10000 photos with about 500 useful for sale. Maybe at most 1500 can be sold.

My question is: do people actually sell photos taken with mobile cameras? If yes, how frequently and can they earn a proper income from it?

I'd go to Shutterstock or Flickr Collections? Posting them on these sites costs nothing, usually. See what's selling and see if you can make a name for yourself, then maybe try to set something professional up.